A breathtaking 8k ultra-realistic depiction of a fearsome demon reminiscent of the Night King from Game of Thrones, created by George R. R. Martin. The creature is portrayed in full body, draped in intricate armor that shimmers with hues of purple and blue neon, exuding an ornate design. The scene is bathed in cinematic lighting, emphasizing the demon's terrifying presence. This artwork is trending on ArtStation, rendered in 4k with hyperrealistic precision. The attention to detail is remarkable, utilizing Unreal Engine 5 for a lifelike finish. The composition is intensely focused, capturing every sinister nuance of the demon’s appearance.